1 files changed, 24 insertions, 0 deletions
diff --git a/Narrow.lua b/Narrow.lua
new file mode 100644
index 0000000..4445983
--- /dev/null
+++ b/Narrow.lua
@@ -0,0 +1,24 @@
+local Narrow, parent = torch.class('nn.Narrow', 'nn.Module')
+
+function Narrow:__init(dimension,offset,length)
+   parent.__init(self)
+   self.dimension=dimension
+   self.index=offset
+   self.length=length or 1
+   if not dimension or not offset then
+      error('nn.Narrow(dimension, offset, length)')
+   end
+end
+
+function Narrow:updateOutput(input)
+   local output=input:narrow(self.dimension,self.index,self.length);
+   self.output:resizeAs(output)
+   return self.output:copy(output)
+end
+
+function Narrow:updateGradInput(input, gradOutput)
+   self.gradInput:resizeAs(input)  
+   self.gradInput:zero();
+   self.gradInput:narrow(self.dimension,self.index,self.length):copy(gradOutput)
+   return self.gradInput
+end